The method of extracting precious metals from the containing material

 

(57) Abstract:

The invention relates to processes for the recovery of precious metals from the containing material, which may be the sludge, spent catalysts, ore, etc., the Method includes processing the source material of the reagent solution upon irradiation of the microwave field with the translation of the noble metals in solution. The treatment is carried out using as a reagent acid and/or oxidizing agent with the formation of suspensie of the starting material and the reagent solution. The power emitted per unit volume of the suspension support in the interval 10010000 kW/m3. In addition, exposure to lead up to the boiling point of the suspension. The technical result is to increase the degree of extraction of precious metals and the determination of the interval of the required power. 2 C.p. f-crystals.

The technical field to which the invention relates

The present invention relates to processes for the recovery of precious metals from the containing material, which may be the sludge, spent catalysts, ore, etc.

Art

Well-known traditional and most effective method of extraction of precious metals in the form of pay is from oxidizers, for example, the Royal vodka (Hcl:NGO3=3:1), in particular, when it is boiling (O. E. Zvyagintsev "the Refining of gold, silver, platinum, 1945, S. 116).

The disadvantage of this method is its substantial duration: pre-treatment on cold for 3-4 hours, when to drain from the reactor to the spent solution of Aqua Regia through 1820 hours, Bay fresh solution and further processing within 12 hours.

The method for extracting noble metals as platinum material by treating the material with a mixture of HNO3and Hcl at high temperature (+250o(C) under pressure (R. Side "decomposition Methods in analytical chemistry", 1984, S. 194-197). In this case, take the excess Hcl, and the treatment is carried out in an autoclave lined with Teflon.

The disadvantage of this method is the presence of high pressure and the need for sophisticated equipment to implement the method.

The method for extracting noble metals as platinum group metals from spent automotive catalysts (US 3985854 A1, 423/22, 1975) by treating the crushed catalyst for various solutions of acids and oxidizing agents (Hcl+CL2, HCl+H2O2

For all known the above methods are characterized by high corrosion aggressiveness of applied solutions, which is the reason for the use of quartz or borosilicate glass, porcelain, PTFE reactor sludge treatment plants and the achievement of high temperatures of the solution by traditional heating the walls of the reactor by burning gas, high temperature heat transfer fluids, or heated. Properties of the materials used, such as the increased fragility of the glass and porcelain, the low thermal conductivity of PTFE and disadvantages of methods of heating, such as the inertia of the heating, local overheating of the walls of the reactor, the temperature gradient as you move away from the walls of the reactor to its axis in the reagent slurry in suspension, due to low reliability (GOST 27002-89) the above methods of extraction of precious metals.

The closest in technical essence and the achieved result to the present invention is a method of extracting precious metals from the containing material, including processing of source reagent material under irradiation of microwave field (EN 2059008 A1, 22, 11/00, 3/04, 1996). In the known method, respectively 9697 and 96 %.

It should be noted that in the claims and the description of the way - the closest analogue is stated that "the processing of source material reagent produced by irradiation of the ultra high frequency currents". Besides, it's clearly stated that this necessarily is heated mixture of the material with the reagent. That heating this mixture in the way is the nearest analogue is, can indirectly put the example 2 of the patent specification, which indicates that the irradiation of the microwave currents is carried out in an electric furnace "electronics". From literature it is known (see, for example, the textbook Y. S. Arkhangelsk "microwave electrothermics". Saratov state technical University, 1998, page 5, last paragraph) that "high frequency, dielectric or microwave is called the heating of the object by the energy of the electromagnetic field of microwave frequencies". This technical terminology used in the description of method - the closest analogue and this way.

The main disadvantages of the method - the closest analogue is composed of the following factors:

- insufficient extraction of gold and platinum from the source material, unacceptable for modern refineries;

- lack of the and with the reagent.

The invention

The technical result for the solution of which the present invention is directed, is to increase the degree of extraction of precious metals and the determination of the interval required power emitted per unit volume of suspension to obtain maximum recovery of noble metals and prevent waste of energy.

The technical result is achieved in the method of extracting precious metals from the containing material, comprising processing the source material of the reagent solution upon irradiation of the microwave field with the translation of the noble metal in the solution, the treatment is carried out using as a reagent acid and/or oxidizing agent with formation of a suspension of the starting material and the reagent solution while maintaining the power emitted per unit volume of suspension, in the range of 100-10000 kW/m3. In addition, exposure to lead up to the boiling point of the suspension, the acid and/or oxidant using Hcl and/or Cl2HCl and/or H2O2, HCl and/or VG2, HCl and/or NaClO3HCl and/or HNO3the mixture of HF and HCl and/or HNO3the mixture of N2SO4and HCl and/or H202the mixture of HCl and NVG and/or H2O2the mixture of HCl and HI and/ilma invention are that the treatment is carried out using as a reagent acid and/or oxidizing agent with formation of a suspension of the starting material and the reagent solution while maintaining the power emitted per unit volume of suspension, in the range 10010000 kW/m3.

Additional distinctive features of the present invention lies in the fact that the irradiation leads to the boiling point of the suspension, and the acid and/or oxidant using HCl and/or CL2HCl and/or H2ABOUT2HCl and/or VG2HCl and/or NaClO3HCl and/or HNO3the mixture of HF and HCl and/or HNO3the mixture of N2SO4and HCl and/or H2O2the mixture of HCl and NVG and/or H2O2the mixture of HCl and Hl and/or NaClO3and I2HCl and/or Cl2and CH2.

The present invention meets the condition of patentability - novelty", as in the prior art failed to find technical solutions, the essential features which would coincide with all the features available in the independent claims of the present invention. The present invention meets the condition of patentability "inventive step", since the prior art has failed to find technical solutions, hallmark the present invention.

Information confirming the possibility of carrying out the invention

The present invention is illustrated below by examples.

Example 1. The material in 25 ml of crushed sludge containing 0.1 wt. % palladium and about 99.9 wt.% oxides of silicon, aluminum, calcium, iron, Nickel, copper and other elements, placed in a glass reactor with a volume of 1500 ml with a stirrer, connected with one or two droppers with a reverse condenser. The reactor is mounted in a domestic microwave oven Samsung, with maximum power and energy of the electromagnetic field of ultra-high frequency (SHF-field) radiated in the furnace of 1.2 kW. Outside of the furnace are droppers and the feedback capacitor. Dropper necessary for uniform (dropwise) feeding oxidant to the reactor during the entire treatment period, and a condenser for condensing vapors of acids and oxidizers and return them to the reactor. As the reagent is used acid - 35% Hcl, 75 ml which is poured into the reactor. Start processing of the material, which includes the mixer and set the power of microwave energy radiated into the furnace of 1.0 kW. In the process slurry and the reagent to form a suspension, which is heated for 2 hours at a temperature of 100oC, p 10-6m3= 10000 kW/m3. After processing, the suspension is fed to the filter, the filtrate is poured into the container, and the filter cake washed with water and sent to the dump. The palladium content in the filtrate is determined that the degree of extraction of palladium is 98,9 %.

Example 2. The processing performed according to example 1, with the difference that in the reactor is placed 250 ml crushed slurry, pour 750 ml of Hcl 35, set the power of microwave energy radiated into the oven 0.1 kW, the processing time is 5 hours, the amount of microwave energy emitted per unit volume of suspension is 0.1/ (250 ml sludge +750 ml reagent)10-6=100 kW/m3. The degree of extraction is to 98.6%.

Example 3. The processing performed according to example 1 with the difference that sets the performance of microwave energy radiated into the oven 0,45 kW, the processing time is 3.5 hours, the amount of microwave energy emitted per unit volume of suspension, is 0.45/(25 ml sludge +75 ml reagent) 10-6=4500 kW/m3. The degree of extraction is 98,7%.

Example 4. The processing performed according to example 1, with the difference that sets the performance of microwave energy radiated into the oven 1.1 kW, the amount of microwave energy emitted per unit volume of suspension, extending t the ' strong pythoncom, zahlebyvayas capacitor, it is possible destruction with the loss of precious metals and evaporation of the liquid, resulting in the overuse of chemicals and electricity. The extraction rate was 98.0%.

Example 5. The processing performed according to example 1, with the difference that in the reactor is placed 250 ml crushed sludge, 750 ml of 35% Hcl, set the power of microwave energy radiated into the oven 0,099 kW, the processing time is 5 hours, the amount of microwave energy emitted per unit volume of suspension is 0,099/(250 ml sludge +750 ml reagent) 10-6=99 kW/m3. The degree of extraction is 96,2%.

Example 6. The processing performed according to example 1, with the difference that, as a material used 250 ml crushed sludge containing 0.1 wt. % platinum and about 99.9 wt.% oxides of silicon, aluminum, calcium, Nickel, copper and other elements, as acid and 750 ml of 35% Hcl, oxidizer - liquid CL2poured into the dropper, set the power of microwave energy radiated into the oven 0,45 kW, the processing time is 5 hours, the amount of microwave energy emitted per unit volume of a suspension of 0.45/(250 ml sludge + 750 ml reagent) 10-6=4500 kW/m3. The degree of extraction of platinum is 98,9 %.

Example 7. amplifier - 30 % N2O2. The degree of extraction of platinum is 99.1%.

Example 8. Material handling is performed according to the example 6, with the difference that the acid used 35% Hcl, oxidizer - liquid CL2and CH2. The degree of extraction of platinum is to 99.2%.

Example 9. Material handling is performed according to the example 6, with the difference that the acid used 35% Hcl and 50% HI, oxidant - NlO3and I2. The degree of extraction of platinum is to 99.2%.

Example 10. Material handling is performed according to the example 6, with the difference that, as a material used 250 ml of spent catalyst APK-2 containing 1,51,8 wt.% palladium and 98,598,2 wt.% aluminium oxide as oxidant 70% HN3. The degree of extraction of palladium is 99.0%.

Example 11. Material handling is performed according to the example 6, with the difference that, as a material used crushed ore containing 0.1 wt.% gold, as an oxidizer 70% NGO3. The degree of extraction of gold is 99.1%.

Example 12. Material handling is performed according to the example 6, with the difference that the use of material containing 0.08 wt.% platinum, of 99.2 wt.% silica, the acid used 450 ml of 40% HF and 300 ml of 35 the processing of the material is conducted according to example 6, with the difference that, as a material used spent catalyst containing about 0.14 wt.% platinum and 0.95 wt.% of aluminum oxide, the acid used 98% N2S04and 35% Hcl, as an oxidizer 30% N2ABOUT2. The degree of extraction of platinum is 98.8%.

From the comparison results, the degree of extraction of precious metals from examples 1-3 with similar results example 4-5 shows the following. When the number of allocated when the irradiation power is below the lower limit in the formula of the invention (example 5), the degree of extraction is significantly reduced, namely a 98.9% in example 1 to 96.2% in example 5. When the number of allocated when the irradiation power is above the upper limit in the formula of the invention according to example 4, the degree of extraction of noble metals (equal in this case 98,0%), remains at the same level as in the examples 3-98,698,9%. Therefore, to increase the number of allocated under irradiation of microwave energy is above the upper limit in the claims is impractical from the point of view of increasing the efficiency of extraction of precious metals and, in addition, it leads to waste of energy.

From the comparison of the results of examples 1-3 and 6-13 and method - the closest analogue is seen that the steppe metals in the way - the nearest analogue (9697%) on 1,62,9%.

Thus, the present invention can be implemented using known means and is most effectively applied for the recovery of precious metals from the containing material, which may be the sludge, spent catalysts ore, etc.

1. The method of extracting precious metals from the containing material, comprising processing the source material of the reagent solution upon irradiation of the microwave field with the translation of the noble metals in solution, characterized in that the treatment is carried out using as a reagent acid and/or oxidizing agent with formation of a suspension of the starting material and the reagent solution while maintaining the power emitted per unit volume of suspension, in the range 10010000 kW/m3.

2. The method according to p. 1, characterized in that the irradiation leads to the boiling point of the suspension.

3. The method according to p. 1, characterized in that the acid and/or oxidant using Hcl and/or CL2, HCl and/or H2ABOUT2, HCl and/or VG2, HCl and/or NlO3, HCl and/or HNO3mixtures of HF and Hcl and/or HNO3mixtures of H2SO4and Hcl and/or H2O2mixtures of Hcl and NVG and/or H2O2

 

Same patents:

The invention relates to the extraction of titanium from leucoxene concentrate, obtained during the concentration of oil-bearing silicon-titanium ores

The invention relates to ferrous metallurgy, in particular to methods for processing of such raw material for titanium pigment titanium dioxide

The invention relates to the processing of the poor manganese ore, in particular, ferromanganese nodules in the Baltic sea shelf, as well as sludge and dust Ferroalloy furnaces sulfuric acid method and can be used in the production of various manganese products

The invention relates to the hydrometallurgical processing of ore concentrates, and more particularly to the processing of loparite concentrate and can be used in complex extraction of compounds of titanium, niobium and tantalum
The invention relates to ferrous metallurgy, namely the recovery of valuable components of scandium from the intermediate products of the refining of bauxite to alumina - specialnyh dust precipitator or red mud

The invention relates to the production of rare metals and, in particular, recycling of semiconductor compounds based on gallium
The invention relates to a method of dissolving zirconium in recycled materials, and can be used for the extraction of zirconium from construction materials and waste metallurgical and mechanical operations of the production of zirconium, its alloys and products

The invention relates to hydrometallurgy, to methods of extraction of useful components using a continuous pressure oxidative leaching of metals
The invention relates to methods for extracting precious metals from spent catalysts and electrochemical processes in fluidized or fixed layer

The invention relates to hydrometallurgy, in particular the leaching of Nickel, cobalt, molybdenum, vanadium material with an inorganic base, and can be used for the processing of spent catalysts

The invention relates to the metallurgy of gold, in particular to the technology heap and percolation leaching of gold, and can be used to extract gold from ore dressing products and old tailings processing plants containing large amounts of fine material that causes difficulties, as in the formation of the heap, and in the filtering process leach solution

The invention relates to the processing of sulfide gold-arsenic concentrates by hydrometallurgical methods using microorganisms
The invention relates to hydrometallurgy of precious metals, in particular to the recovery of precious metals from cyanide solutions and/or slurries

The invention relates to the field of metallurgy of noble metals
The invention relates to the metallurgy of noble metals and can be used in the processing of raw materials with high content of base impurities

The invention relates to the metallurgy of non-ferrous metals, namely the recovery of gold and silver from silicate concentrates obtained in the processing of gold ores in which gold is present in the form of a solution in sulfides, as well as in the form of native

The invention relates to chemical technology, namely the extraction of sludge containing metals of the platinum group
The invention relates to hydrometallurgy platinum metals

The invention relates to the field of metallurgy of noble metals, in particular to the pyrometallurgical processing of concentrates containing silver and gold

The invention relates to a method of recovering chlorine from solutions obtained in the chemical, pulp and paper and steel industry, and can be used in the recovery of gold from solutions containing active chlorine

FIELD: noble metal hydrometallurgy.

SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.

EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.

2 ex

Up!